<div id="myApp" class="wrapper">
    <div style="padding-bottom: 4px">
        <span>
            <button onclick="onStopMessages()">&#9632; Stop</button>
            <button onclick="onStartLoad()">&#9658; Start</button>
        </span>
        <span style="margin-left: 30px">
            <button onclick="updateChart('stackedColumn')">Stacked Column Chart</button>
            <button onclick="updateChart('groupedColumn')">Grouped Column Chart</button>
            <button onclick="updateChart('line')">Line Chart</button>
        </span>
    </div>
    <div id="myGrid" class="my-grid"></div>
    <div id="myChart" class="my-chart"></div>
</div>
